{"id":1025,"date":"2026-03-05T09:17:01","date_gmt":"2026-03-05T09:17:01","guid":{"rendered":"https:\/\/www.merckvaccines.com\/enflonsia\/?page_id=1025"},"modified":"2026-03-23T08:49:29","modified_gmt":"2026-03-23T08:49:29","slug":"dosing-administration","status":"publish","type":"page","link":"https:\/\/www.merckvaccines.com\/enflonsia\/dosing-administration\/","title":{"rendered":"Dosage and administration"},"content":{"rendered":"\n<p><\/p>\n\n\n<link rel='stylesheet' id='vivid360-hero-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/hero\/css\/style.min.css?ver=1765535927' media='all' \/>\n\n<div id=\"\" class=\"wp-block-vivid360-hero\"><div class=\"vivid360-hero-container align-left align-top ratio-50-50 horizontal desktop text-align-left has-primary-color is-overlay-style is-card-overlay is-white-overlay mobile-is-split-style mobile-split-image-bottom mobile-uses-custom-styles\" style=\"border-width:0;border-style:solid;border-top-left-radius:0;border-top-right-radius:0;border-bottom-right-radius:0;border-bottom-left-radius:0;--minHeight:253px;--mobileMinHeight:288px\"><div class=\"wide_screens hidden\" data-value=\"default\"><\/div><picture><source media=\"(max-width: 767px)\" srcset=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Mobile_Dosage-and-Administration_RGB_993193.jpg?w=767\"\/><source media=\"(min-width: 768px) and (max-width:1024px)\" srcset=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Dosage-and-Administration_RGB_2ca8ee.jpg?w=1024\"\/><source media=\"(min-width: 1025px) and (max-width:1440px)\" srcset=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Dosage-and-Administration_RGB_2ca8ee.jpg?w=1440\"\/><img decoding=\"async\" width=\"4512\" height=\"1012\" loading=\"lazy\" data-src=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Dosage-and-Administration_RGB_2ca8ee.jpg?w=1920\" src=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Dosage-and-Administration_RGB_2ca8ee.jpg?w=1920\" alt=\"\" class=\"hero-image\" style=\"--desktop-focal-x:80%;--desktop-focal-y:50%;--mobile-focal-x:50%;--mobile-focal-y:50%;--tablet-focal-x:80%;--tablet-focal-y:50%\"\/><\/picture><div class=\"hero-wrapper\"><div class=\"hero-content\"><h1 style=\"--headlineFontSize:36px;--headlineFontSizeTablet:36px;--headlineFontSizeMobile:24px;--headlineLineHeight:45px;--headlineLineHeightTablet:45px;--headlineLineHeightMobile:30px\" class=\"hero-title fontWeightBold\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-primary-color\"><strong>Streamline passive immunization with non-weight-based <mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-primary-color\"><strong>dosing<\/strong> with<\/mark><\/strong><\/mark> <mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-primary-color\"><strong>ENFLONSIA<sup>TM<\/sup> <span class=\"no-wrap-text\">(clesrovimab-cfor)<\/span><\/strong><\/mark><\/h1><p style=\"--contentFontSize:18px;--contentLineHeight:27px;--contentFontSizeMobile:18px;--contentLineHeightMobile:27px\" class=\"hero-description\"><\/p><div class=\"hero-btn-group\"><\/div><div class=\"hero-caption\"><\/div><\/div><\/div><\/div><div class=\"hero-caption-2desktop\"><\/div><\/div>\n\n\n<link rel='stylesheet' id='vivid360-spacer-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/spacer\/css\/style.min.css?ver=1765535928' media='all' \/>\n\n<div style=\"background-color:transparent;height:32px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-32\"><\/div>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center mb-0 is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:40%\"><link rel='stylesheet' id='vivid360-image-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/image\/css\/style.min.css?ver=1765535927' media='all' \/>\n\n<div class=\"wp-block-vivid360-image img-container\"><figure class=\"wp-block-vivid360-image is-style-default has-mobile-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"249\" src=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Dosage-Admin_Syringe_RGB.png\" alt=\"\" class=\"wp-image-1028  style-noshadow deskHeightAuto deskWidthAuto \" title=\"\" style=\"height:249px;width:700px\" srcset=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Dosage-Admin_Syringe_RGB.png 700w, https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Dosage-Admin_Syringe_RGB.png?resize=300,107 300w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Dosage-Admin_Syringe_RGB.png\" alt=\"\" class=\"wp-image-1028  style-noshadow mobile-image mobHeightAuto mobWidthAuto \" width=\"700\" height=\"249\" title=\"\" style=\"height:249px;width:700px\" srcset=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Dosage-Admin_Syringe_RGB.png 700w, https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Dosage-Admin_Syringe_RGB.png?resize=300,107 300w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/figure><\/div>\n\n\n\n<p class=\"has-text-align-center\">Not actual size shown<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\"><link rel='stylesheet' id='vivid360-list-parent-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/list-parent\/css\/style.css?ver=1765535927' media='all' \/>\n\n<div class=\"vivid-block-list2 content-width  \">\n<ul style=\"--listBulletColor:#333\" class=\"list-bullet-color\">\n<li class=\"has-medium-font-size\"><strong>Delivers antibodies with the same dose<\/strong><br>The recommended dose of ENFLONSIA is 105 mg administered as a single intramuscular (IM) injection<sup>a<\/sup><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Helps provide protection<\/strong><br>for infants born during or entering their first RSV season<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>A 30-month shelf life<sup>1<\/sup><\/strong><br>Which may enhance efficiency and inventory management<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div style=\"background-color:transparent;height:16px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-16\"><\/div>\n\n\n\n<div style=\"background-color:transparent;--desktop-spacer:2px;--mobile-spacer:8px;--tablet-spacer:2px\" class=\"wp-block-vivid360-spacer vivid360-spacer-desktop vivid360-spacer-mobile vivid360-spacer-tablet\"><\/div>\n\n\n\n<p class=\"has-dark-text-color has-text-color has-link-color has-medium-font-size wp-elements-9833faf35d66498fc968224f4c3489af\"><sup>a<\/sup><strong>For infants undergoing cardiac surgery<\/strong> with cardiopulmonary bypass during or entering their first RSV season, <strong>an additional 105 mg dose is recommended as soon as the infant is stable<\/strong> after surgery to ensure adequate clesrovimab-cfor serum levels.<\/p>\n\n\n\n<div style=\"background-color:transparent;height:16px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-16\"><\/div>\n\n\n<link rel='stylesheet' id='vivid360-row-module-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/row\/css\/style.min.css?ver=6.8.5' media='all' \/>\n\n<div style=\"border-width:0px;border-style:;border-radius:0;background-color:#fffbf0\" class=\"wp-block-vivid360-row vivid360-row hcp-wide-bg-width full-page-width\"><div class=\"cropped\" id=\"row5c313fc4-7ecb-4d62-96e4-9930fc7da081\"><div style=\"padding-top:24px;padding-bottom:24px;padding-right:24px;padding-left:24px\" class=\"row-content wide-width hcp-wide-width\"><link rel='stylesheet' id='vivid360-heading-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/heading\/css\/style.min.css?ver=1765535927' media='all' \/>\n\n<div class=\"vivid360-heading default-hcp-fontsize default-hcp-tablet-fontsize\" id=\"a4eb0cfa4-2142-4f9f-9fa0-d3db18c3275b\"><h2 class=\"has-primary-color content-width fontWeightBold mt-0 mb-0\" style=\"--desktopFontSize:var(--h2FontSizeDesktop);--tabletFontSize:var(--h2FontSizeDesktop);--mobileFontSize:20px;--desktopLineHeightSize:var(--h2LineHeightDesktop);--tabletLineHeightSize:var(--h2LineHeightDesktop);--mobileLineHeightSize:\" id=\"\">Timing of ENFLONSIA<\/h2><\/div>\n\n\n\n<div style=\"background-color:transparent;height:8px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-8\"><\/div>\n\n\n\n<p>For neonates and infants born during the RSV season, administer ENFLONSIA once starting from birth. For infants born outside the RSV season, administer ENFLONSIA once prior to the start of their first RSV season considering 5 months duration of protection by ENFLONSIA.<\/p>\n\n\n\n<div style=\"background-color:transparent;--desktop-spacer:24px;--mobile-spacer:24px;--tablet-spacer:24px\" class=\"wp-block-vivid360-spacer vivid360-spacer-desktop vivid360-spacer-mobile vivid360-spacer-tablet\"><\/div>\n\n\n\n<div class=\"vivid360-heading default-hcp-fontsize default-hcp-tablet-fontsize\" id=\"a3a17414a-dce5-4876-9a9f-52ec86dc32a4\"><h2 class=\"has-primary-color content-width fontWeightBold mt-0 mb-0\" style=\"--desktopFontSize:var(--h2FontSizeDesktop);--tabletFontSize:var(--h2FontSizeDesktop);--mobileFontSize:20px;--desktopLineHeightSize:var(--h2LineHeightDesktop);--tabletLineHeightSize:var(--h2LineHeightDesktop);--mobileLineHeightSize:\" id=\"\">Co-administration with routine childhood vaccines<\/h2><\/div>\n\n\n\n<div style=\"background-color:transparent;height:8px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-8\"><\/div>\n\n\n\n<p>ENFLONSIA can be given concomitantly with childhood vaccines. When ENFLONSIA is administered concomitantly with injectable vaccines, it should be given using a separate syringe and at a different injection site. Do not mix ENFLONSIA with any vaccines or medications in the same syringe or vial.<\/p>\n\n\n\n<div style=\"background-color:transparent;height:8px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-8\"><\/div>\n\n\n\n<p>There is no information regarding co-administration of ENFLONSIA with other immunoglobulin products. There are no data regarding substitution of ENFLONSIA for palivizumab once prophylaxis treatment is initiated with palivizumab for the RSV season.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div style=\"background-color:transparent;--desktop-spacer:56px;--mobile-spacer:56px;--tablet-spacer:56px\" class=\"wp-block-vivid360-spacer vivid360-spacer-desktop vivid360-spacer-mobile vivid360-spacer-tablet\"><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><link rel='stylesheet' id='vivid360-card-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/card\/css\/style.min.css?ver=1773226567' media='all' \/>\n\n<div id=\"\" class=\"wp-block-vivid360-card a9e95d566-9dba-4dc3-b5f4-7f12d5464fa9 vivid360-block-card has-text-align-left hasBoxShadow card-horizontal has-dark-text-color full-page-width\" style=\"border-width:0px;border-style:;border-radius:0\"><div class=\"card-media \"><i role=\"img\" aria-label=\"\" aria-hidden=\"true\" class=\"icon-dna \"><\/i><\/div><div class=\"card-content\"><div class=\"card-content-wrap\"><h3 class=\"card-header fontWeightBold\">See how ENFLONSIA works<\/h3><p class=\"card-link entire-card left\"><a class=\"\" href=\"https:\/\/www.merckvaccines.com\/enflonsia\/mechanism-of-action\/\" role=\"button\" style=\"border-radius:4px\" title=\"\" target=\"_self\" rel=\"noopener\" data-design-category=\"link\" data-design-label=\"\" data-design-module=\"element\"><\/a><\/p><\/div><div class=\"\"><div class=\"card-icon-right\"><i role=\"link\" aria-label=\"\" aria-hidden=\"true\" class=\"icon-arrow-right\"><\/i><\/div><\/div><\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div id=\"\" class=\"wp-block-vivid360-card ae7d87ea8-41b5-4121-98c1-7d1eb332d300 vivid360-block-card has-text-align-left hasBoxShadow card-horizontal has-dark-text-color full-page-width\" style=\"border-width:0px;border-style:;border-radius:0\"><div class=\"card-media \"><i role=\"img\" aria-label=\"\" aria-hidden=\"true\" class=\"icon-question-outline has-white-color has-primary-background-color\"><\/i><\/div><div class=\"card-content\"><div class=\"card-content-wrap\"><h3 class=\"card-header fontWeightBold\">Frequently asked questions<\/h3><p class=\"card-link entire-card left\"><a class=\"\" href=\"https:\/\/www.merckvaccines.com\/enflonsia\/frequently-asked-questions\/\" role=\"button\" style=\"border-radius:4px\" title=\"\" target=\"_self\" rel=\"noopener\" data-design-category=\"link\" data-design-label=\"\" data-design-module=\"element\"><\/a><\/p><\/div><div class=\"\"><div class=\"card-icon-right\"><i role=\"link\" aria-label=\"\" aria-hidden=\"true\" class=\"icon-arrow-right\"><\/i><\/div><\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"vivid360-heading default-hcp-fontsize default-hcp-tablet-fontsize default-hcp-mobile-fontsize\" id=\"a314eb98a-89dd-458c-94a7-6fe0ea16a211\"><h2 class=\"content-width fontWeightRegular\" style=\"--desktopFontSize:var(--h2FontSizeDesktop);--tabletFontSize:var(--h2FontSizeDesktop);--mobileFontSize:var(--h2FontSizeMobile);--desktopLineHeightSize:var(--h2LineHeightDesktop);--tabletLineHeightSize:var(--h2LineHeightDesktop);--mobileLineHeightSize:\" id=\"\"><strong>Reference:<\/strong><\/h2><\/div>\n\n\n\n<div class=\"vivid-block-list2 content-width  \">\n<ol style=\"--listBulletColor:#333\" class=\"list-bullet-color\">\n<li>US Food &amp; Drug Administration Center for Drug Evaluation and Research. <em>BLA Approval Letter<\/em>. Published June 9, 2025. Accessed October 21, 2025. <span class=\"word-break\">https:\/\/www.accessdata.fda.gov\/drugsatfda_docs\/nda\/2025\/761432Orig1s000Approv.pdf<\/span><\/li>\n<\/ol>\n<\/div>\n\n\n<link rel='stylesheet' id='vivid360-modal-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/modal\/css\/style.min.css?ver=1769466497' media='all' \/>\n\n<div class=\"wp-block-vivid360-modal\"><div><div class=\"vivid360-modal-block-container is-style-passive-modal-two-btn\"><div class=\"vivid360-modal-trigger-container\"><span id=\"inlineTrigger\" role=\"link\" data-design-module=\"modal\" data-design-category=\"link\" class=\"vivid360-modal-trigger vivid360-modal-trigger-hide\">patientSite<\/span><\/div><div class=\"vivid360-modal-container null\"><div class=\"vivid360-modal\" style=\"color:#00857c\"><div class=\"vivid360-modal-content-area\"><a class=\"vivid360-modal-close-modal-span\" role=\"button\" aria-label=\"modal popup close\"><i class=\"icon-close\"><\/i><\/a><div class=\"modal-flex-container\"><div class=\"vivid360-modal-label-container  title-left\" style=\"--titleColor:#00857c\"><h2><\/h2><\/div><div class=\"vivid360-modal-content-container has-regular-font-size\">\n\n<div class=\"paragraph-wrapper\"><div class=\"_f8540334-67b7-42f1-908f-628bcea940e7 \" id=\"\"><p style=\"font-size:24px\"><strong>By clicking on this link, you will be leaving Merck Vaccines.<\/strong><\/p><\/div><\/div>\n\n<\/div><div class=\"vivid360-modal-button-container desktop-container\"><div class=\"vivid360-button-block\"><a class=\"btn primary primary-regular btn-confirm has-white-background-color vivid360-modal-dismiss-button\" role=\"button\" aria-label=\"Button 1\" style=\"font-size:14px;border-style:solid;border-color:#00857c;color:#00857c\" href=\"#!\" title=\"Cancel\" target=\"_self\" rel=\"noopener\" data-design-category=\"button\" data-design-label=\"Cancel\" data-design-module=\"element\">Cancel<\/a><\/div><div 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class=\"vivid360-button-block\"><a class=\"btn primary primary-regular btn-dismissive  vivid360-modal-action-button\" role=\"button\" aria-label=\"Button 2\" style=\"font-size:14px;border-style:solid;border-color:#00857c;background-color:#00857c\" href=\"https:\/\/www.enflonsia.com\/\" title=\"Proceed\" target=\"_blank\" rel=\"noopener\" data-design-category=\"button\" data-design-label=\"Proceed\" data-design-module=\"element\">Proceed<\/a><\/div><\/div><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Not actual size shown aFor infants undergoing cardiac surgery with cardiopulmonary bypass during or entering their first RSV season, an additional 105&#8230;<\/p>\n","protected":false},"author":4249,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_trash_the_other_posts":false,"editor_notices":[],"footnotes":""},"ga4_page_audience":[203],"ga4_page_birn_id":[],"ga4_page_branding":[220],"ga4_page_businessunit":[],"ga4_page_campaign":[],"ga4_page_content_purpose":[242],"ga4_page_customer_journey_stage":[297],"ga4_page_customer_specialty":[345],"ga4_page_experience":[],"ga4_page_indication":[],"ga4_page_material_intent":[551],"ga4_page_product":[779],"ga4_page_region":[976],"ga4_page_therapeuticarea":[],"class_list":["post-1025","page","type-page","status-publish"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dosing &amp; Administration for ENFLONSIA\u2122 (clesrovimab-cfor)<\/title>\n<meta name=\"description\" content=\"Review dosing and administration 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